Any keyboard designed to be Top of the line...will have at least a 5 year run... any improvements with a quality designed instrument will be soft updates.

I must say this Yamaha with the Tyros,1,2,3,4,and 5 set a a poor example.

Yamaha psr speaks for itself(terrible).

Korg is not far behind with so many PAX models..

They are just not thought out to contend as Top models.

My thoughts are that the Genos may be the first Yamaha arranger that merits a top rating.